<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    var SingleTon=(function(){
        function Tank(){
            this.dom=null
            this.speed=0
            this.color=''
            this.run=function(){}
        }
        var instance=null
        return{
            getInstance(){
                return instance?instance:(instance=new Tank)
            }
        }
    })()

    var a=SingleTon.getInstance()
    var b=SingleTon.getInstance()
    console.log(a==b)
</script>
</html>